Mato gbgich



M. GRGICH. LOCK.

APPLICATION HLED DEC-7.1915.

1 1 95,8@& Patented Aug. 22, 1916.

M ATO GRGICI-I, OF CHICAGO, ILLINOIS.

LOCK.

Original application filed August 31, 1914, Serial No. 859,437.

To all whom it may concern:

Be it known that I, MATo GRGICI-I, a sub? ject of the Emperor ofAustria-Hungary, and a resident of the city of Chicago, county of Cook,and State of Illinois, have invented certain new and useful Improvementsin Locks, of which the following is a specification.

My invention relates to locks and particularly to key hole guards forlooks.

More specifically the present application is a division of my co-pendingapplication Serial No. 859337, filed August 31, 191%.

The object of my invention is to provide the key hole of a lock withmeans to prevent tampering with the lock or rendering the tamperingtherewith difficult.

A further object of my invention is to provide a key hole guard withmeans for securing the same in operative position.

Other objects will appear hereinafter.

With these objects in view my invention consists generally in ashiftable plate mounted adjacent the key hole of a lock and providedwith an opening adapted in one position to register with the key hole toadmit the insertion of the key.

My invention further consists in a key hole guard as mentioned providedwith means for securing thesame with the aperture out of register withthe key hole. A

My invention further consists in a key hole guard as mentioned in whichthe se curing device consists of a spring detent mounted on theshiftable plate and adapted in one position to engage within theaperture therein.

More specifically my invention consists in a plate pivotally mountedadjacent a key hole and provided with an aperture adapted to registerwith the key hole when in one position said plate being provided with aslot arranged radially with relation to the aperture in the plate, astud slidably mounted in said slot, a spring detent adapted to engagewithin the aperture in said plate when said stud is at the inner end ofsaid radial slot, there being an arcuate slot in the lock casing toreceive said stud when at the outer end of the radial slot and saidarcuate slot being provided with a radial enlargement to permit shiftingof the stud.

' My invention further consists in various details of construction andarrangement of Specification of Letters Patent.

vention,

Patented Aug. 22;, 1916. Divided and this application filed DecemberSerial N 0. 65,465.

parts all as will be fully described hereinafter and particularlypointed out inthe claims.

tion, and in which- Figure l is a plan view of a lock equipped with akey hole guard embodying my in- Fig. 2 is a section 011 the line of Fig.1, portions being shown in elevation, Fig. 3 is a section on the line cof Fig. 2, Fig. 4 is a plan View of the lock casing with the shiftableplate and correlated parts removed, the same being substantially asection on the line 2-2 of Fig. 2, and Fig. 5 is a plan view of the lockcasing equipped with the spring detent shifted to release the plate.

Referring now to the drawings, l and 2 indicate relatively movable partssuch as a door or other hingedly mounted closure and cooperating-frame.Fixed to the frame 2 is a keeper 3 let into the frame and pro vided witha threaded bore 4:.

Secured to the swinging closure 1 by a suitable fastening means is astrap 5, preferably formed of two sections hingedly connected as at 6,andupon the swinging portion 7 of the strap I arrange the barrel 8 ofthe lock The barrel is preferably cylindrical and is closed atits outerend by a head 9 and at its inner end b the member 7 of the strap.Arranged within the barrel is the locking bolt 10 which is preferablycoaxial with the barrel and threaded to engage within the threaded bore4; of the keeper. The bolt is provided with a cylindrical head 11 formedwith a socket 12 to receive the end of a key; and parallel guides 13 areprovided for the head 11. To look or unlock the device the key isengaged within the socket in 'the head of the bolt and the bolt rotated,the guides 13 maintaining the bolt in proper alinement. This portion ofthe device is covered by my co-pending application above mentioned andforms no part of the present invention, as it will be clear that the keyhole guard hereinafter described may be used with various forms of locksbut I have de scribed the lock with which I employ the guard in order topresent the same more clearly. The head 9 of the lock barrel or casingis provided with a key hole 14: and

shiftably mounted adjacent said key hole is a plate 15. This ispreferably arranged to rotate with the center of the key hole as anaxis, and is provided with an aperture 16 adapted, when the plate is inone position, to register with the key hole to permit insertion andremoval of the key. To shiftably attach the plate to the barrel head Iprovide the head 9 with oppositely disposed arcuate slots 17 and 18which receive headed stud pins 19 and 20 respectively on the plate 15.The pin 20 is preferably rigidly secured to the plate 15 but the pin 19is loosely mounted ina radial slot 21 formed in said plate. Ihe key hole1 1 and aperture 16 are brought into register when said pins are at oneend of the slots 17 and 18 and at the opposite end of the slot 17 Iprovide a radial enlargement 22 which registers with the radial slot 21when the plate is shifted to the opposite limit of its movement. The pin19 is then free to be moved inwardly into the said enlargement 22 whichlocks the plate against movement.

Mounted upon the pin 19 is a swinging member 23 preferably formed ofthin spring metal and provided on its under face with a detent 24 whichengages within the aperture 16 only when the pin 19 is at the innermostend of the slot 21. This effectually secures the device against beingsuccessfully tampered with except by those familiar with the device, asto insert the key it is first necessary to swing the member 23 todisengage the detent from the aperture 16, then to move the pin 19radially outwardly and then shift the plate until the pins 19 and 20 areat the opposite extremities of the slots.

I claim:

1. A lock casing provided with a key hole, a plate rotatably mountedupon said casing adjacent said key hole with said key hole as a centerand provided with a centrally disposed aperture adapted when the plateis in one position to register with said key hole and a shiftable memberon said plate for securing said plate in position with said aperture outof register with said key hole.-

2. A lock casing provided with a key hole in combination with a platerotatably mounted adjacent said key hole with said key hole as a centerand provided with a centrally disposed aperture adapted when in oneposition to register with said key hole, and a cooperating slot andshiftable pin on said casing and said plate respectively for holding thelatter in position with the aperture out of register with the key hole.

3. A lock casing provided with a key hole in combination with a platerotatably mounted adjacent said key hole with said key hole as a centerand provided with an aperture adapted when in one position to registerwith said key hole, said casing be- 1,195,sos

ing provided with a slot extending in the direction of movement of saidrotatable plate, said slot being provided with an off-set portion, and apin shiftably mounted upon said plate and adapted to be moved into saidon"- set portion to lock said plate with the aperture out of registerwith the key hole, substantially as described. I

41. A lock casing provided with a key hole in combination with a platerotatably mounted adjacent said key hole with said key hole as a centerand provided with an aperture adapted. when in one position to registerwith said key hole, said casing being provided with a slot extending inthe direction of movement of said rotatable plate, said slot beingprovided with an off-set portion, a pin shiftably mounted upon saidplate and adapted to be moved into said offset portion to lock saidplate with the aperture out of register with the key hole, and a membermounted on said pin and provided with a detent adapted to engage in saidaperture when said pin is in the oif-set portion of said slot,substantially as described.

5. A lock casing provided with a key hole in combination with a plateshiftably mounted adjacent said key hole and provided with an apertureadapted when in one position to register with said key hole, said casingbeing provided with a slot extending in the direction of movement ofsaidshiftable plate, said slot being provided with an off-set portion, apin shiftably mounted upon said plate and adapted to be moved'into saidoff-set portion to lock said plate with the aperture out of registerwith the key hole, and a resilient member mounted on said pin andprovided with a detent adapted to en gage in said aperture when said pinis in the off-set portion of said slot, substantially as described.

6. A look casing provided with a key hole in combination with a plateshiftably mounted adjacent said key hole and provided with an apertureadapted when in one position to register with said key hole, said casingbeing provided with a slot extending in the direction of movement ofsaid shiftable plate, said slot being provided with an off-set portion,a pin shiftably mounted upon said plate and adapted to be moved intosaid off-set portion to lock said plate with the aperture out ofregister with the key hole, and a member pivotally mounted on said pinand provided with a detent adapted to engage in said aperture when saidpin is in the off-set portion of said slot, substantially as described.

7. A look casing provided with a key hole in combination with a plateshiftably mounted adjacent said key hole and provided with an apertureadapted when in one position to register with said key hole, said casingbeing provided with a slot extending in the direction of movement ofsaid shiftable plate, said slot being provided with an off-set portion,a pin shiftably mounted upon said plate and adapted to be moved into Von said pin and provided with a detent adapted to engage in saidaperture when said pin is in the oii-set portion of said slot,substantially as described.

8. A look casing provided with a key hole in combination with a plateshiftably mounted adjacent said key hole and provided with an apertureadapted, when the plate is in one position, to register with said keyhole, said plate being provided with a slot positioned substantiallyradially with relation to said aperture, a stud pin slidably mounted insaid slot, there being a slot in said lock casing to receive said pinand provided with a radial enlargement adapted to register with saidradial slot when the plate is moved to extreme position with itsaperture out of register with the key hole and a spring detentpivotal-1y mounted 011 said stud pin and adapted to engage within saidaperture when sald stud pin is at the 1n- Copies of this patent may heobtained for ward extremity of said radial slot, substantially asdescribed.

9. A look casing provided with a key hole and a pair of oppositelydisposed arcuate slots concentric with said key hole, in combinationwith a disk provided with a pair of stud pins engaging in said slots,said plate being provided with a central aperture adapted in oneposition to register with said key hole and also provided with a radialslot to receive one of said stud pins and permit radial movement of thesame therein, one of said arcuate slots being provided with a radialenlargement adapted to register with said radial slot when the plate ispositioned with its aperture out of register with the key hole and aspring detent on said shiftable stud pin adapted to engage in saidaperture when said pin is at the inner end of said slot, substantiallyas described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

MATO GRGICI-I.

lVitnesses:

JOSHUA R. H. POTTS, HELEN F. LILLIS.

five cents each, by addressing the Commissioner of Patents, Washington,D. G.

